Backlight assembly and liquid crystal display apparatus having the same

ABSTRACT

A backlight assembly and an LCD apparatus capable of reducing power consumption and increasing brightness of a light. The backlight assembly includes a light guide plate for receiving an external light and an artificial light, a first receiving container for receiving the light guide plate and supplying the artificial light to the light guide plate, and a second receiving container for supplying the external light to the light guide plate, the second receiving container comprising an light side wall inclined to the light guide plate. The LCD panel assembly displays images using the external light and artificial light from the light guide plate.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. patent applicationSer. No. 10/366,829, filed on Feb. 14, 2003 now U.S. Pat. No. 6,929,392,the disclosure of which is herein incorporated by reference in itsentirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a backlight assembly and an LCD (LiquidCrystal Display) apparatus, and more particularly to a backlightassembly capable of reducing power consumption and increasing brightnessof a light and an LCD apparatus having the same.

2. Description of the Related Art

LCD apparatuses typically display information such as a character, astill picture, and a moving picture by using a liquid crystal in whichlight transmittance is varied in response to an intensity of an electricfield. The LCD apparatuses perform display operation using a light, forexample, an external light such as sunshine, an illumination, etc., oran artificial light.

LCD apparatuses include reflective LCD apparatuses and transmissive LCDapparatuses. The reflective LCD apparatuses display images using areflective electrode in which sunshine or illumination is reflected to aliquid crystal. However, the reflective LCD apparatuses may not displaythe images where an amount of the external light is not enough todisplay the images.

The transmissive LCD apparatuses display images using a transparentelectrode which transmits the artificial light generated by consuming anelectric energy. The transparent electrode is made of ITO (Indium TinOxide) or IZO (Indium Zinc Oxide). Since the transmissive LCDapparatuses use only the artificial light to display the images, thetransmissive LCD apparatuses consume a lot of power.

Recently, transreflective LCD apparatuses have been developed so as tosolve disadvantages of the reflective LCD apparatuses and transmissiveLCD apparatuses. The transreflective LCD apparatuses comprise atransparent electrode and a reflective electrode. The reflectiveelectrode of the transreflective LCD apparatuses is disposed on thetransparent electrode and includes an opening to partially expose thetransparent electrode. The transreflective LCD apparatuses displayimages using an external light where an amount of the external light issufficient for such display, while the apparatuses display the imagesusing an artificial light where an amount of the external light isinsufficient for display purposes.

However, the transreflective LCD apparatuses have a lower brightness ascompared with those of the reflective LCD apparatuses and transmissiveLCD apparatuses, while the transreflective LCD apparatuses can displayimages regardless of a presence of the external light.

SUMMARY OF THE INVENTION

The present invention provides a backlight assembly capable of reducingpower consumption and increasing brightness of a light.

The present invention also provides an LCD apparatus having thebacklight assembly. According one embodiment of the invention, abacklight assembly comprises a light guide plate comprising a first sidesurface for receiving an external light, a second side surface forreceiving an artificial light, a third side surface and a fourth sidesurface for connecting the first side surface to the second sidesurface, a light reflecting surface for reflecting the external lightand the artificial light, and a light emitting surface facing the lightreflecting surface; a first receiving container for receiving the lightguide plate and for supplying the artificial light to the secondsurface, the first receiving container comprising first to thirdsidewalls for covering the second to fourth side surfaces of the lightguide plate; and a second receiving container having a bottom surface,fourth to sixth sidewalls for covering the first to third sidewalls, anda lighting sidewall for supplying the external light to the firstsurface, wherein the fourth to sixth sidewalls are extended from thebottom surface, and wherein the lighting sidewall is extended from thebottom surface, inclined with respect to the first side surface andconnected between fifth and sixth sidewalls.

According to another embodiment of the present invention, a backlightassembly comprises a light guide plate comprising an externallight-lighting body, the external light-lighting body comprising a lightreflecting side surface for reflecting an external light from a firstdirection to a second direction, a light receiving surface for receivingan artificial light from a third direction, a light reflecting surfacefor reflecting the external light and artificial light to a fourthdirection, at least one side surface adjacent to the light receivingsurface, and a light emitting surface for emitting the external lightand the artificial light having the fourth direction; a first receivingcontainer comprising a first sidewall for covering the light receivingsurface and the at least one side surface, wherein the first receivingcontainer supplies the artificial light to the light receiving surface;a second receiving container comprising a bottom surface, a secondsidewall extended from the bottom surface, and a lighting sidewallextended from the bottom surface and connected to the second sidewall,wherein the lighting sidewall is inclined with respect to the bottomsurface; and a light reflecting means disposed over the lightingsidewall and bottom surface.

According to a further of the present invention, an LCD apparatuscomprises a backlight assembly comprising a light guide plate forreceiving an external light and an artificial light in differentdirections, a first receiving container for receiving the light guideplate and supplying the artificial light to the light guide plate,wherein the second receiving container comprises an lighting sidewallbeing inclined with respect to the light guide plate; an LCD panelassembly for converting the external light and artificial light into animage light having image information; and a chassis comprising a chassisbody for exposing an effective display area of the LCD panel assemblyand an external light-inducting window disposed on a portion of thechassis body corresponding to the lighting sidewall, wherein the chassisis combined to the second receiving container so as to fix the LCD panelassembly to the second receiving container.

Advantageously, the backlight assembly and LCD apparatus according tothe present invention uses both an external light and an artificiallight to display the image. Thus, to the backlight assembly and LCDapparatus may reduce power consumption and increase brightness of thelight.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other advantages of the present invention will becomereadily apparent by reference to the following detailed description whenconsidered in conjunction with the accompanying drawings wherein:

FIG. 1A is an exploded perspective view showing a backlight assemblyaccording to a first embodiment of the present invention;

FIG. 1B is a cross-sectional view taken along the line II—II for showingthe light guide plate shown in FIG. 1A;

FIG. 1C is a cross-sectional view taken along the line III—III forpartially showing the first receiving container shown in FIG. 1A;

FIG. 2 is a cross-sectional view taken along the line IV—IV for showingthe second receiving container shown in FIG. 1;

FIG. 3 is an exploded perspective view showing a backlight assemblyaccording to a second embodiment of the present invention;

FIG. 4 is a perspective view showing a light guide plate according to athird embodiment of the present invention;

FIG. 5 is a cross-sectional view taken along the line V—V for showingthe light guide plate shown in FIG. 4;

FIG. 6 is an exploded perspective view showing a backlight assemblyaccording to a fourth embodiment of the present invention;

FIG. 7 is an exploded perspective view showing an LCD apparatusaccording to a fifth embodiment of the present invention;

FIG. 8 is a cross-sectional view showing the LCD panel assembly shown inFIG. 7;

FIG. 9 is a cross-sectional view showing the LCD apparatus shown in FIG.7; and

FIGS. 10 to 12 are schematic views showing an LCD apparatus according toa sixth embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION Embodiment 1

FIG. 1A is an exploded perspective view showing a backlight assemblyaccording to a first embodiment of the present invention. FIG. 1B is across-sectional view taken along the line II—II for showing the lightguide plate shown in FIG. 1A. FIG. 1C is a cross-sectional view takenalong the line III—III for partially showing the first receivingcontainer shown in FIG. 1A.

Referring to FIGS. 1A to 1C, a backlight assembly 900 comprises a lamp340 for generating a light, a light guide plate 100 for guiding a light,a first receiving container 300 for receiving the light guide plate 100and lamp 340, and a second receiving container 400 for receiving thefirst receiving container 300 and for guiding an external light to thelight guide plate 100.

The light guide plate 100 may have a rectangular parallelepiped. Forexample, the light guide plate 100 comprises first to fourth sidesurfaces 110, 120, 130 and 140, a light reflecting surface 150, and alight emitting surface 160. The first side surface 110 faces the secondside surface 120, and the first and second side surfaces 110 and 120 areconnected to each other by the third and fourth side surfaces 130 and140.

The first side surface 110 receives the external light and the secondside surface 120 receives an artificial light generated by consuming anelectric energy. The external light supplied through the first sidesurface 110 and the artificial light supplied through the second sidesurface 120 are reflected from the light reflecting surface 150 andprovided to the light emitting surface 160.

The third side surface 130 is provided with a first fixing protrusion135 and the fourth side surface 140 is provided with a second fixingprotrusion 145. The first and second fixing protrusions 135 and 145 arepartially protruded from the third and fourth side surfaces 130 and 140,respectively. Each of the first and second fixing protrusions 135 and145 has a pair of protrusions separated from each other.

The first receiving container 300 comprises a first receiving containersidewall 350 for covering the second to fourth side surfaces 120, 130and 140, a first fixing recess 352 b corresponding to the first fixingprotrusion 135, a second fixing recess 356 b corresponding to the secondfixing protrusion 145.

The first receiving container sidewall 350 includes a first sidewall 352for covering the third side surface 130, a second sidewall 354 forcovering the second side surface 120, and a third sidewall 356 forcovering the fourth side surface 140. The first, second and thirdsidewalls 352, 354 and 356 are stepped toward the third, second andfourth side surfaces 130, 120 and 140, respectively. Each of the firstand third sidewalls 352 and 356 is provided with first and second steps352 c and 356 c on which the first and second fixing recesses 352 b and356 b are disposed, respectively.

The first receiving container 300 further includes a connection bar 358for connecting the first and third sidewalls 352 and 356 to prevent anLCD panel from being moved. The connection bar 358 is disposed on thefirst and second steps 352 c and 356 c such that the connection bar 358does not obstruct the light guide plate 100 to receive the externallight through the first side surface 110.

As shown in FIG. 1C, the lamp 340 is adjacent to the second sidewall354. For example, the lamp 340 is received in a lamp receiving space 354a provided with the second sidewall 354 of the first receiving container350. The lamp 340 comprises a point light source such as a lightemitting diode or a linear light source such as a cold cathodefluorescent lamp. The first receiving container 300 is received in thesecond receiving container 400. The second receiving container 400 fixesthe light guide plate 100 and lamp 340 in the first receiving container300 as well as supplies the external light to the light guide plate 100.

Referring to FIG. 1A, the second receiving container 400 comprises abottom surface 450, fourth to sixth sidewalls 420, 430 and 440 (whichcorrespond to the second, third and first sidewalls 354, 356 and 352),and a lighting sidewall 410. The second receiving container 400 is madeof a metal material and the bottom surface 450 has a plate shape havingfirst to fourth edge portions 452, 454, 456 and 458.

The fourth to sixth sidewalls 420, 430 and 440 are extended from thesecond to fourth edge portions 454, 456 and 458, respectively. Forinstance, the fourth to sixth sidewalls 420, 430 and 440 are extendeduntil the heights of the fourth to sixth sidewalls 420, 430 and 440 aresubstantially identical to those of the first to third sidewalls 352,354 and 356 of the first receiving container 300. Accordingly, each ofthe fourth to sixth sidewalls 420, 430 and 440 of the second receivingcontainer 400 covers the second, third and first sidewalls 354, 356 and352 of the first receiving container 300.

The lighting sidewall 410 is disposed at the first edge portion 452 andfaces the first side surface 110 of the light guide plate 100. Thelighting sidewall 410 is inclined with respect to the first side surface110 toward the external.

FIG. 2 is a cross-sectional view taken along the line IV—IV for showingthe second receiving container shown in FIG. 1.

Referring to FIG. 2, an inclined angle “α” of the lighting sidewall 410with respect to the first side surface 110 is more than about 0 degreeand less than about 90 degrees. The angle between the lighting sidewall410 and the first side surface 110 is more than about 0 degree and lessthan about 90 degrees.

An entire size of the backlight assembly 900 may be reduced. Forexample, a size of the second receiving container 400 is reducedaccording as the inclined angle “α” of the lighting sidewall 410 isclosed to about 0 degree. Where the inclined angle “α” of the lightingsidewall 410 is closed to about 0 degree, an amount of the lightsupplied to the first side surface 110 through the lighting sidewall 410decreases.

The entire size of the backlight assembly 900 may be enlarged. Forexample, the size of the second receiving container 400 is enlargedaccording as the inclined angle “α” of the lighting sidewall 410 isclosed to about 90 degrees. Where the inclined angle “α” of the lightingsidewall 410 is closed to about 90 degrees, the amount of the lightsupplied to the first side surface 110 through the lighting sidewall 410increases.

The inclined angle “α” of the lighting sidewall 410 is preferably setinto an angle appropriate to reduce the size of the second receivingcontainer 400 and increase the amount of the light supplied to the firstside surface 110 of the light guide plate 110. In preferred embodimentsof the present invention, the inclined angle “α” of the lightingsidewall 410 with respect to the first side surface 110 is set intoabout 45 degrees.

Where the inclined angle “α” is about 45 degrees, the lighting sidewall410 may be easily damaged by an impact from the external. In order tomaintain a shape of the lighting sidewall 410, the first and the thirdsidewalls 352 and 356 are provided with first and second end portions352 a and 356 a, respectively. Each of the first and second end portions352 a and 356 a are inclined to the lighting sidewall 410 at an inverseangle of the inclined angle “α”.

For instance, where the inclined angle “α” of the lighting sidewall 410is about 145 degrees with respect to the bottom surface 450 of thesecond receiving container 400, the first and second end portions 352 aand 356 a are formed to have an inclined angle of about 315 degrees withrespect to the bottom surface 450 of the second receiving container 400.

The second receiving container 400 further includes a reflecting member415 for increasing an inclining efficiency of the external light on thefirst side surface 110 of the light guide plate 100. The reflectingmember 415 is disposed on the lighting sidewall 410 to face the firstside surface 110 of the light guide plate 100.

Embodiment 2

FIG. 3 is an exploded perspective view showing a backlight assemblyaccording to a second embodiment of the present invention.

A backlight assembly 900 comprises a light guide plate 100, lamp 340,first receiving container 300 and second receiving container 400. Thebacklight assembly 900 provides the external light and artificial lightto the LCD panel to display the image. In preferred embodiments of thepresent invention, the backlight assembly 900 further comprises anoptical sheet 200 and a reflecting plate 500 in order to display highquality image.

The optical sheet 200 comprises a diffusion sheet 240 and a prism sheet250. The diffusion sheet 240 is disposed on the light emitting surface160 of the light guide plate 100 to uniformly maintain brightness of thelight emitted from the light emitting surface 160. The prism sheet 250is disposed on the diffusion sheet 240 to control a direction and avisual angle of the light emitted from the diffusion sheet 240. Thereflecting plate 500 is disposed under the light guide plate 100 toreflect the light leaked from the light reflecting surface 150 to thelight guide plate 100.

The diffusion sheet 240 is provided with a plurality of third fixingprotrusions 242 partially extended from end portions thereof. The prismsheet 250 is provided with a plurality of fourth fixing protrusions 252partially extended from end portions thereof. The third and fourthfixing protrusions 242 and 252 are received in the first and secondfixing recesses 352 b and 356 b of the first receiving container 300,respectively, when the diffusion and prism sheets 240 and 250 arereceived in the first receiving container 300.

The backlight assembly 900 receives the external light through thelighting sidewall 410 of the second receiving container 400 and thefirst side surface 110 of the light guide plate 100 and receives theartificial light emitted from the lamp 340 through the second sidesurface 120 of the light guide plate 100. The external light andartificial light are reflected from the light reflecting surface 150 ofthe light guide plate 100 and emitted through the light emitting surface160 of the light guide plate 100.

Embodiment 3

FIG. 4 is a perspective view showing a light guide plate according to athird embodiment of the present invention. FIG. 5 is a cross-sectionalview taken along the line V—V for showing the light guide plate shown inFIG. 4.

A light guide plate 150 further includes an external light-lighting body160 disposed on a first side surface 152 of the light guide plate 150.

The external light-lighting body 160 includes a first light reflectingsurface 162, a second light reflecting surface 164, and a lightingsurface 165.

The first light reflecting surface 162 is extended from a first edgeportion 152 a where a light emitting surface 154 of the light guideplate 150 comes in contact with the first side surface 152 thereoftoward an upper portion of the light emitting surface 154. The firstlight reflecting surface 162 is perpendicular to the light emittingsurface 154 and parallel to the first side surface 152. The second lightreflecting surface 164 is extended from a second edge portion 153 awhere a light reflecting surface 153 of the light guide plate 150 comesin contact with the first side surface 152 thereof. The second lightreflecting surface 164 is inclined to the first side surface 110 at anangle of β. For instance, the second light reflecting surface 164 isinclined parallel to the lighting sidewall 410 of the second receivingcontainer 400. The lighting surface 165 connects between the first andsecond light reflecting surfaces 162 and 163.

The first light reflecting surface 162 reflects an external light (thatis not inclined on the second light reflecting surface 164) to thesecond reflecting surface 164 so as to increase an amount of theexternal light supplied to the light guide plate 150.

The external light-lighting body 160 may further includes a first lightreflecting sheet 162 a disposed on the first light reflecting surface162 to reduce an amount of the external light leaked from the firstlight reflecting surface 162. Further, the external light-lighting body160 may further includes a second light reflecting sheet 163 a disposedon the second light reflecting surface 164 to reduce an amount of theexternal light leaked from the second light reflecting surface 164.

Embodiment 4

FIG. 6 is an exploded perspective view showing a backlight assemblyaccording to a fourth embodiment of the present invention.

Referring to FIG. 6, a backlight assembly 900 further includes a lightreflecting sheet 480 disposed over the lighting sidewall 410 and bottomsurface 450 of the second receiving container 400. Advantageously, anumber of steps for assembling the backlight assembly 900 may be reducedby disposing the light reflecting sheet 480 on the lighting sidewall 410and bottom surface 450. Further, a reflecting plate (for example, thereflecting plate 500 of FIG. 3) may be removed in the embodiment, anumber of parts of the backlight assembly 900 may be reduced, therebyreducing an entire thickness of the backlight assembly 900.

Embodiment 5

FIG. 7 is an exploded perspective view showing an LCD apparatusaccording to a fifth embodiment of the present invention. FIG. 8 is across-sectional view showing the LCD panel assembly shown in FIG. 7.

An LCD apparatus 1000 comprises a backlight assembly 900, an LCD panelassembly 950 received in the backlight assembly 900, a chassis 960 and alower case 970 for combining the backlight assembly 900 to the LCD panelassembly 950.

The LCD panel assembly 950 comprises a reflective LCD panel assembly, atransmissive LCD panel assembly or a transreflective LCD panel assembly.In a preferred embodiment of the present invention, the transmissive LCDpanel assembly is employed as the LCD panel assembly 950.

The transmissive LCD panel assembly 950 comprises a TFT (thin filmtransistor) substrate 951, a liquid crystal 952, and a color filtersubstrate 953.

The TFT substrate 951 comprises a transparent glass substrate. Forexample, the TFT substrate 951 comprises a plurality of TFTs 951 adisposed on the substrate 951 in a matrix configuration, a pixelelectrode 951 b for receiving a power voltage from the TFTs 951 a, and afirst alignment layer 951 c.

The color filter substrate 953 faces the TFT substrate 951. The colorfilter substrate 953 comprises a color filter 953 a disposed on atransparent glass substrate, a common electrode 953 b entirely disposedon the transparent glass substrate to cover the color filter 953 a, anda second alignment layer 953 c. The color filter 953 a faces the pixelelectrode 951 b of the TFT substrate 951.

The liquid crystal 952 is interposed between the TFT substrate 951 andcolor filter substrate 953. In order to interpose the liquid crystal 952between the TFT substrate 951 and color filter substrate 953, the TFTsubstrate 951 is separated from the color filter substrate 953 in apredetermined distance. A spacer (not shown) and a sealant (not shown)may be formed between the TFT substrate 951 and color filter substrate953 is maintained the predetermined distance.

The transmissive LCD panel assembly 950 is received in the firstreceiving container 300 of the backlight assembly 900. The transmissiveLCD panel assembly 950 is disposed on the first and second steps 352 cand 356 c of the first receiving container 300. The reflecting plate500, light guide plate 100 and optical sheet 200 are disposed under thetransmissive LCD panel assembly 950.

The chassis 960 comprises a first surface 961 having a rectangular frameshape to expose an effective display area of the transmissive LCD panelassembly 950 and a second surface 962 extended from an edge of the firstsurface 961 and perpendicular to the first surface 961. The secondsurface 962 of the chassis 960 is outwardly combined to the fourth tosixth sidewalls 420, 430 and 440 of the second receiving container 400.

The first receiving container 300 prevents the transmissive LCD panelassembly 950 from being moved in a horizontal direction. The chassis 960prevents the transmissive LCD panel assembly 950 from being moved in avertical direction. Also, the chassis 960 may prevent an edge portion ofthe transmissive LCD panel assembly 950 from being damaged and remove astatic electricity of the transmissive LCD panel assembly 950.

FIG. 9 is a cross-sectional view showing the LCD apparatus shown in FIG.7.

Referring to FIG. 9, the first surface 961 of the chassis 960 isprovided with an external light-inducting window 961 a for inducting theexternal light into the lighting sidewall 410 of the second receivingcontainer 400 of the backlight assembly 900. The external light issupplied to the lighting sidewall 410 and first side surface 110 of thelight guide plate 100 through the external light-inducting window 961 a.Also, the chassis 960 further comprises a sheet 963 disposed on theexternal light-inducting window 961 a so as to intercept a foreignsubstance flowed in the LCD apparatus 1000 through the externallight-inducting window 961 a.

Embodiment 6

FIGS. 10 to 12 are schematic views showing an LCD apparatus according toa sixth embodiment of the present invention.

According to a preferred embodiment of the present invention, a foreignsubstance (which enters the LCD apparatus 1000 through the externallight-inducting window 961 a) can be intercepted by partiallytransforming a shape of the external light-lighting body 160 shown inFIG. 4). The external light-lighting body 160 is provided with a sealingprotrusion 166 disposed on the lighting surface 165. The sealingprotrusion 166 is formed by partially protruding the upper surface ofthe lighting surface 165.

The sealing protrusion 166 has a size identical to that of the externallight-inducting window 961 a and is inserted into the externallight-inducting window 961 a. Thus, the LCD apparatus 1000 can preventthe foreign substance from being flowed into the LCD apparatus 1000.

Advantageously, the backlight assembly and LCD apparatus according topreferred embodiments of the present invention simultaneously supply anexternal and artificial light (e.g., a lamp light) to the LCD panelassembly. Thus, the LCD apparatus increases brightness of the light andreduces the number of parts and power consumption.

Although the LCD panel assembly according to preferred embodiments ofthe present invention comprises the transmissive LCD apparatus, thereflective and transreflective LCD panel assemblies can be applied tothe LCD panel assembly of the present invention. For example, areflective LCD apparatus according to a preferred embodiment of thepresent invention may have a light guide plate disposed on a reflectiveLCD panel assembly for receiving an external light and artificial light.

Although the exemplary embodiments of the present invention have beendescribed, it is understood that the present invention should not belimited to these exemplary embodiments but various changes andmodifications can be made by one ordinary skilled in the art within thespirit and scope of the present invention as hereinafter claimed.

1. An LCD apparatus comprising: a backlight assembly including a lightguide plate for receiving an external light and an artificial light, afirst receiving container for receiving the light guide plate andsupplying the artificial light to the light guide plate, and a secondreceiving container for supplying the external light to the light guideplate, wherein the second receiving container includes a lightingsidewall being inclined with respect to the light guide plate; an LCDpanel assembly for converting the external light and the artificiallight into an image light having image information; and a chassisincluding a chassis body for exposing an effective display area of theLCD panel assembly and an external light-inducting window disposed on aportion of the chassis body and corresponding to the lighting sidewall,wherein the chassis is combined to the second receiving container so asto fix the LCD panel assembly to the second receiving container.
 2. TheLCD apparatus of claim 1, wherein the light guide plate comprises afirst side surface for receiving the external light, a second sidesurface for receiving the artificial light, a third side surface and afourth side surface for connecting the first side surface to the secondside surface, a light reflecting surface for reflecting the externallight and the artificial light, and a light emitting surface facing thelight reflecting surface; wherein the first receiving containercomprises first, second, and third sidewalls for covering the second,third, and fourth side surfaces; and wherein the second receivingcontainer includes a bottom surface and fourth, fifth, and sixthsidewalls extended from the bottom surface for covering the first,second, and third sidewalls, wherein the lighting sidewall is extendedfrom the bottom surface, inclined with respect to the first sidesurface, and connected between the fifth and the sixth sidewalls.
 3. TheLCD apparatus of claim 1, wherein the chassis further comprises a sheetdisposed on the external light-inducting window to intercept a foreignsubstance entering the LCD panel assembly through the externallight-inducting window.
 4. The LCD apparatus of claim 2, wherein thelight guide plate further comprises an external light-lighting body,disposed between the chassis body and the first side surface, forguiding the external light.
 5. The LCD apparatus of claim 4, wherein theexternal light-lighting body comprises: a first light reflecting surfaceextended from a first edge portion where the light emitting surface ofthe light guide plate comes in contact with the first side surface, thefirst light reflecting surface being perpendicular to the light emittingsurface and parallel to the first side surface; a second lightreflecting surface extended from a second edge portion where the lightreflecting surface of the light guide plate comes in contact with thefirst side surface, the second light reflecting surface being inclinedparallel to the lighting sidewall; and a lighting surface for connectingthe first and the second light reflecting surfaces.
 6. The LCD apparatusof claim 5, wherein the lighting surface contacts the chassis body. 7.The LCD apparatus of claim 5, wherein the external light-lighting bodyfurther comprises a sealing protrusion for sealing the externallight-inducting window.